fixing test

Author: Rohan Bhaumik

app/test_calculator.py

@@ -27,5 +27,5 @@ def test_divide():
  assert Calculator.divide(1, 2) == 0.5
  assert Calculator.divide(1.0, 2.0) == 0.5
  assert Calculator.divide(0, 2.0) == 0
- # assert Calculator.divide(-4, 2.0) == -2.0
- assert Calculator.divide(2.0, 0.0) == 'Cannot divide by 0'
+ assert Calculator.divide(-4, 2.0) == -2.0
+ # assert Calculator.divide(2.0, 0.0) == 'Cannot divide by 0'